I spotted this bird in a tree and though I was fairly sure it was a Starling I wasn't immediately convinced. It seemed a bit odd to me, with the fairly brown back and head, and the odd bill with some yellow colour toward the middle but then a dark tip.

Subsequent research suggests it can't really be anything else other than a Starling in its wintery clothing. I thought perhaps the bill was just dirty since I could only find photos with either vibrant yellow bill or pure black, until I found a very similar photo on this page, showing winter plumage and bill that matches my specimen. Case closed.